Campaign Rewards?

Hey, guys. I'm not too sure how to word this because I'm not 100% sure what it is I'm after. (Also how I start my Tinder Bio)

So the other day I completed the Campaign Rewards? I think that is what it's from anyway. I unlocked female crew members and equipment & a percentage off the sale price of tanks. I used the tier 10 % off token to unlock my second tier 10 but I haven't used anything since and now I can't seem to find that screen to bring them up again to use the rest?
If someone could guide me in the right direction that would be great.